B
Bill Kingson
Guest
I have a Shogun brand 12 speed bike I bought new in 1980. I love the old bike and everything works
great, but I'd like to change to a triple crank. I thought I might be able to just swap out the
cranks and be done. So I read through Sheldon Brown's info at the Harris Cyclery, and eventually
went into information overload. (Chainline, chainring clearance, crank clearance, tread, etc.)
Here's what I've sorted out...
Double SR "Tourney" alloy cranks (38/52) Six-speed freewheel (13/30) Derailers and shifters are
Shimano "600" series 68 mm bottom bracket with tapered square axles
I expect that the derailers will have to be replaced to handle the greater range of the triple
cranks. What will I also have to replace... the bottom bracket, shifters, or ??? Is there some kind
of standard conversion for all of this?
I don't want to put junky stuff on the bike, but I don't need top-of-the line either. I'm a
recreational rider with a few big hills in the neighborhood. Any pitfalls, comments,
recommendations?
All replies will be greatly appreciated.
Thanks,
Bill Kingson Caribou, Maine
great, but I'd like to change to a triple crank. I thought I might be able to just swap out the
cranks and be done. So I read through Sheldon Brown's info at the Harris Cyclery, and eventually
went into information overload. (Chainline, chainring clearance, crank clearance, tread, etc.)
Here's what I've sorted out...
Double SR "Tourney" alloy cranks (38/52) Six-speed freewheel (13/30) Derailers and shifters are
Shimano "600" series 68 mm bottom bracket with tapered square axles
I expect that the derailers will have to be replaced to handle the greater range of the triple
cranks. What will I also have to replace... the bottom bracket, shifters, or ??? Is there some kind
of standard conversion for all of this?
I don't want to put junky stuff on the bike, but I don't need top-of-the line either. I'm a
recreational rider with a few big hills in the neighborhood. Any pitfalls, comments,
recommendations?
All replies will be greatly appreciated.
Thanks,
Bill Kingson Caribou, Maine